Smart Module Series
SC690A_Series_Hardware_Design 71 / 105
⚫
The module offers five audio input/output channels, including two digital channels and three analog
channels.
⚫
The output voltage range of MIC_BIAS is programmable between 1.0 V and 2.85 V, and the
maximum output current is 3 mA.
⚫
The earpiece interface uses differential output.
⚫
LINE_OUT for audio external speaker amplifier.
⚫
The headset interface features stereo left and right channel output, and headset insert detection
function is supported.
DMIC1_CLK
46
DO
Digital microphone 1 clock
DMIC2_DATA
168
DIO
Digital microphone 2 data
DMIC2_CLK
169
DO
Digital microphone 2 clock
MIC_BIAS1
44
AO
Microphone bias output voltage 1
MIC_BIAS2
233
AO
Microphone bias output voltage 2
MIC_BIAS3
167
AO
Microphone bias output voltage 3
MIC1_P
218
AI
Microphone input for channel 1 (+)
Used for ECM
microphone by default.
MIC1_P require pulled up
to MIC_BIAS1.
MIC1_M
217
AI
Microphone input for channel 1 (-)
MIC2_P
216
AI
Microphone input for channel 2 (+)
Used for headset
microphone by default.
MIC2_P require pulled up
to MIC_BIAS2.
MIC2_M
215
AI
Microphone input for channel 2 (-)
MIC3_P
214
AI
Microphone input for channel 3 (+)
Used for MEMS
microphone by default.
MIC3_P require pulled up
to MIC_BIAS3.
MIC3_M
213
AI
Microphone input for channel 3 (-)
EAR_P
53
AO
Earpiece output (+)
EAR_M
52
AO
Earpiece output (-)
LINE_OUT_P
181
AO
Aux amplifier output (+)
LINE_OUT_M
180
AO
Aux amplifier output (-)
HPH_R
51
AO
Headphone right channel output
HPH_L
49
AO
Headphone left channel output
HPH_GND
50
AI
Headphone reference ground
HS_DET
48
AI
Headset hot-plug detect
Pulled up internally.
